摘要
为了研究涡发生器(VGs)间距λ对控制边界层分离效果的影响,选取了4种涡发生器间距,λ/H(H为涡发生器高度)分别为5,7,9,11.采用大涡模拟(LES)方法对带逆压梯度的平板边界层分离流动及VGs控制分离流动进行了数值模拟.分析了有无VGs控制时,湍流场中大尺度相干结构及其演化规律,分别从旋涡间距、边界层内流体动能、压差损失等方面考察了VGs间距对控制流动分离效果的影响.研究结果表明当λ/H为5时,VGs间距过小抑制了旋涡的展向发展,λ/H为9,11时,VGs间距过大边界层内流体动能偏低,当间距λ/H为7时流动控制效果更优,此时计算域压差损失最小,相比较无VGs控制时,压差损失降低了30.95%.
In order to study the effect of spacingλof vortex generators（VGs）on the control boundary layer separation,4kinds of vortex generators spacing were selected,andλ/H（His the height of vortex generators）respectively were 5,7,9,11.The boundary layer separation flow of adverse pressure gradient and VGs control flow separation were simulated by large eddy simulation（LES）method.The evolution of the large scale coherent structure in turbulent flow field were analyzed with and without VGs control,and the influence of VGs spacing on the flow separation control effect were investigated from vortex spacing,fluid kinetic energy in the boundary layer,loss of pressure difference,etc.The research resultsshow that whenλ/His 5,the spacing of VGs is too small,so that the spanwise development of vortex are suppressed,whenλ/H are 9,11,the spacing of VGs is too large lead to the fluid kinetic energy in the boundary layer is too low,when the spacing of VGs isλ/His 7,the effect of flow control is better,then the pressure loss of calculation domain is minimum,compared with no VGs control,pressure loss is reduced by 30.95%.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2016年第2期493-502,共10页
Journal of Aerospace Power
基金
国家自然科学基金(51176046)
中央高校基金项目(JB2015193)
关键词
涡发生器
边界层分离
大涡模拟
流动控制
相干结构
vortex generators
boundary layer separation
large eddy simulation（LES）
flow control
coherent structure
